146 FLORIDA GEOLOGICAL SURVEY—THIRD ANNUAL REPORT. 
level. The principal supply is obtained at a depth of two hundred 
feet. 
Feet. 
Record incomplete, said to consist largely of clays, bluish in color 
except where oxidized yellow at the surface. o -128 
A sample from the depth of 128 feet consists of fragments of dark- 
colored rock more or less water worn, including small sharks’ 
teeth, fragments of bones, occasional shining black phos- 
phatic pebbles .128 to 130 
Yellowish sandy clays .130 to 145 
Dark fossiliferous rock. Fragments of this rock are of grayish 
color and contain inclusions of a dark colored mineral 
similar in character to rock found at St. Augustine at a 
depth of 178 feet. Sharks’ teeth and black phosphatic 
pebbles also occur as well as numerous shell fragments... .145 to 160 
A mixed sample contained material similar to above with addi¬ 
tion of gray sandy clay .160 to 168 
Buff colored sandy clay.168 to 180 
White granular fossiliferous limestone.180 to 225 
This well probably reaches the Vicksburg group of limestones 
as indicated by sample from the depth of 180 to 225 feet. The ma¬ 
terial obtained between the depth of 168 and 180 feet may rep¬ 
resent the Upper Oligocene as it has certain lithological resem- 
blences to parts of the Alum Bluff formation. The conglomerate 
material from 145 to 160 feet together with a part of the over- 
lying clays probably represents the Jacksonville formation of the 
Miocene. 
HASTINGS. 
Hastings is in the western part of St. Johns County, and is lo¬ 
cated on Deep Creek, a tributary to the St. Johns River. The town 
site is inland about three miles from the river. The elevation at 
Hastings, at the residence of T. H. Hastings is according to the U. 
S. Coast and Geodetic Survey 8 feet above sea. 
A considerable number of artesian wells have been put down 
at and in the vicinity of Hastings. Record has been obtained 
of fifty-one wells within a radius of three miles of the town. 
Wells at Hastings are largely used for irrigating purposes. 
The average depth of the wells now in use is 148 to 272 feet al¬ 
though some reach a greater depth. Most of the wells are 4 to 6 in¬ 
ches in diameter. The length of casing used in the wells is variable 
ranging from 65 to 170 feet. 
